Raucous protesters and supporters of Donald Trump violently confronted each other as he spoke in California

COSTA MESA, Calif. (AP) — Raucous protesters and supporters of Donald Trump violently confronted each other in California leading to some 20 arrests as the Republican presidential contender brought his campaign to conservative Orange County after sweeping the Northeast GOP primaries.

COSTA MESA, California — Raucous protesters and supporters of Donald Trump violently confronted each other in California, leading to some 20 arrests as the Republican presidential contender brought his campaign to conservative Orange County after sweeping the Northeast GOP primaries.

Dozens of protesters were mostly peaceful Thursday as Trump gave his speech inside the Pacific Amphitheatre. After the event, however, the demonstration grew rowdy late in the evening and spilled into the streets.

About 20 people were arrested by Costa Mesa police, according to a tweet from the Orange County Sheriff's Department. One Trump supporter had his face bloodied in a scuffle as he tried to drive out of the arena. One man jumped on a police car, leaving its front and rear windows smashed and the top dented in, and other protesters sprayed graffiti on a police car and the venue's marquee.

Dozens of cars — including those of Trump supporters trying to leave — were stuck in the street as several hundred demonstrators blocked the road, waved Mexican flags and posed for selfies.

Police officers in riot gear and on horseback pushed the crowd back and away from the venue. There were no major injuries, and the police did not use any force. The crowd began dispersing about three hours after the speech ended.

Earlier in the evening, a half-dozen anti-Trump protesters taunted those waiting to get into the venue. Trump supporters surrounded one man who waved a Mexican flag and shouted "Build that wall! Build that wall!" — a reference to Trump's call to create a barrier between the US and Mexico to stop illegal border crossings.

At one point, seven women wearing no shirts and Bernie Sanders stickers over their breasts entered the square outside the amphitheater. They said they were protesting Trump's lack of engagement on issues of gender equality and women's rights.

"I feel like he wants to make America great again, but certainly not for women, for the LBGTQ community, or for the lower class," said one of the women, Tiernan Hebron. "He has, like, done nothing to help with gender equality or women's rights or reproductive rights or anything."

Trump has drawn large crowds across the country as he has campaigned for the White House, and some of his events have been marred by incidents both inside and outside these venues.

An overhead view of protesters at a campaign rally for Donald Trump in Orange County, California. Screenshot via KNBC 4

Earlier this week, a Trump rally in nearby Anaheim, California, turned contentious when his supporters and protesters clashed, leaving several people struck by pepper spray. Trump was not present.

Trump has drawn large crowds to most of his campaign events, and Thursday was no exception. The Pacific Amphitheatre was filled to its capacity of about 18,000, and many hundreds more were turned away.

Ly Kou, 47, of Ontario, said she liked Trump because of his vow to put the country first.

"It's obvious that America loves Trump," said Kou, who is from Laos, as she pointed at the waiting throng. "This thing about him being racist? Look around the crowd."

Trump was traveling from the rally site to the state's Republican convention in Burlington in the San Francisco Bay area.